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Magnonlike dispersion of spin resonance in Ni-doped BaFe$_2$As$_2$

Inelastic neutron scattering measurements on Ba(Fe$_{0.963}$Ni$_{0.037}$)$_2$As$_2$ manifest a neutron spin resonance in the superconducting state with anisotropic dispersion within the Fe layer. Whereas the resonance is sharply peaked at Q$_{AFM}$ along the orthorhombic a axis, the resonance disperses upwards away from Q$_{AFM}$ along the b axis. In contrast to the downward dispersing resonance and hour-glass shape of the spin excitations in superconducting cuprates, the resonance in electron-doped BaFe$_2$As$_2$ compounds possesses a magnon-like upwards dispersion.

preprint2013arXivOpen access
M. G. KimG. S. TuckerD. K. PrattS. RanA. ThalerA. D. ChristiansonK. MartyA. PodlesnyakS. L. Bud'koP. C. CanfieldA. KreyssigA. I. GoldmanR. J. McQueeney
cond-mat.supr-concond-mat.str-el
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M. G. KimG. S. TuckerD. K. PrattS. RanA. ThalerA. D. ChristiansonK. MartyA. PodlesnyakS. L. Bud'koP. C. CanfieldA. KreyssigA. I. GoldmanR. J. McQueeney

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